Harry's magical parents were killed by the evil wizard Voldemort when he was just a baby. Miraculously, he survived with only a lightning-bolt scar as a mysterious reminder. Harry is taken to live with his nasty relatives -- muggles, or non-wizards -- who hide the truth about his parents. Ten miserable years later, he gets a visit from a genial half-giant named Hagrid with an invitation to study at Hogwarts School of Witchcraft and Wizardry. At the school, Harry makes friends, fights trolls, learns how to play the fantastic aerial school sport, Quidditch, and uncovers a three-headed dog that guards a secret. Meanwhile, he must contend with Professor Snape, who hates him, and Draco Malfoy, a bratty student. When a mystery arises about the Sorcerer's Stone, which is supposed to possess the powers of immortality, Harry discovers that Voldemort is trying to steal it so he can regain his powers.